Ā key factor here is the nature of the data. The data that systems like Tom Tom 
are built on is notionally complete. That is to say all significant features of 
a type which are in existence are in the data set when it is created. This 
means the data files for systems like Tom Tom change relatively slowly. But, it 
is only feasible commercially for limited data sets; roads, rail, geographic 
data, postcodes etc. 

The data set for OSM is quite different. For one, it is FAR richer and more 
diverse. Tom Tom will not provide info on cafes with associated opening times, 
wheelchair access and WiFi availability information.  In this regard OSM data 
is also far less complete. 

My point is that in terms of comparison to the functionality of commercial GPS 
I'd say the OSM data is complete nowadays. If you are using OSMAnd as an 
alternative to Tom Tom, then monthly updates which come out a month behind are 
fine.

But, if you use OSMAnd for the far richer data, it is not such a good 
situtation. Or at least, you have to accept you could be missing out on a LOT 
of detail created in the interim 8 weeks. 

The problem for me, is that it is this richer data that I want for trips. When, 
as is often the case, there is a lot of useful data missing i will mai it a 
part of my trip research. That way everyone gets to benefit in the long run. 
But I don't plan every trip far enough ahead that all the research is complete 
2 months in advance. Hence the delay between updating the database and 
receiving that information in OSMAnd can be a problem. 

Now I've sussed the map creator I can compile and download a new New Zealand 
map in 90 minutes of so.

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